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问题
填空题
推焦时出现大量黑烟说明焦炭()。
答案
参考答案:偏生
猜谜题,问答题
读句子猜谜并画出来。
1. If you look in my face, I am somebody.
If you look in my back, I am nobody.
It's a
.
2. What has four legs, but can't walk?
It's a
.
3. What goes around the world, but stays in one corner?
It's a
.
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填空题
植物鞣质是一种许多物质的复杂混合物,它是由多种不同的有鞣性的()和无鞣性的()所组成。
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